@Ehsan from comment #30 ("I'd be curious to know, FWIW!"):

Turns out that the Thunderbird e-mail front end is one big JS/XUL application:
http://mxr.mozilla.org/comm-central/source/editor/ui/composer/content/editor.js

I haven't looked very much, but I can answer some questions. For example the 
"Bold button" is defined here:
http://mxr.mozilla.org/comm-central/source/editor/ui/composer/content/editorOverlay.xul#1138
There is an observer, so when the bold state changes, it gets noticed and the 
UI is updated.

I will now hunt through this code to see whether I can find the cause of
the lost font.

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https://bugs.launchpad.net/bugs/584632

Title:
  composer changes font mid email

Status in Mozilla Thunderbird Mail and News:
  Confirmed
Status in thunderbird package in Ubuntu:
  Confirmed

Bug description:
  Binary package hint: thunderbird

  As I'm typing my emails in Thunderbird, I can see what appears to be a
  font size change on screen, normally in the second line of text. The
  second line appear smaller than the first. It's barely perceptible, so
  half them time I think I am imagining it.

  Well, I've started Bccing to myself to check, and the emails I am
  receiving from myself are not only a different size, they're also a
  different font. Composer starts in some default serif, and by the
  second line is sans. I'd bee glad to email someone viz thunderbird,
  and also send along a screenshot of how it looks while I am typing.

  Thanks.

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